declare a boolean in C

  bool flag = true; 

This code declares a boolean variable, called “flag”, with a value of true. The keyword “bool” tells the compiler that the variable is a boolean, which can only have one of two values: true or false. The assignment operator ”=” sets the value of the variable to true. Booleans are often used in programming logic, to check whether a certain condition has been met or not. For example, if the boolean variable “flag” is true, then the program can proceed with the task, or if it is false, the program will move on to the next task. This is just one example of how a boolean can be used in programming.